extract ClientManager from server.js

Make client manager more robust when piping connections.

bin/server

@@ -45,5 +45,14 @@ process.on('SIGTERM', () => {
     process.exit();
 });
 
+process.on('uncaughtException', (err) => {
+    log.error(err);
+    process.exit(1);
+});
+
+process.on('unhandledRejection', (reason, promise) => {
+    log.error(reason);
+});
+
 // vim: ft=javascript